This paper is focused on the development of a theoretical model to simulate the solidification phenomena occurring in twin-roll strip casting, the model of which is referred to as solidifying shell behavior simulation system (SBS). The SBS model attempts to simulate solidification of steel strip from the initial contact between the liquid steel and the roll surface until the end of solidification when the strip is separated from the roll. A focus of the model is the change in discrete contact points as solidification progresses. Features of the SBS model "lens growth solidification" and its further feature "lens width growth by discrete step", three stages of shell solidification (i.e., crowing, combining and floating stages), and development of equations of transient heat transfer from shell to mold by direct contact points. Simultaneous computation of heat transfer, dynamic thermal deformation of the shell and progress of the solidification front is performed in the SBS model.
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